• Proceedings of the Materials Research Society of Korea Conference
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• 1996.11a
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• pp.63-63
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• 1996

• Proceedings of the Materials Research Society of Korea Conference
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• 2001.11a
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• pp.26-26
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• 2001

• Proceedings of the Korean Ceranic Society Conference
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• 2002.10a
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• pp.112.1-112
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• 2002

• Proceedings of the Materials Research Society of Korea Conference
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• 1998.11a
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• pp.55-55
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• 1998

• Proceedings of the Materials Research Society of Korea Conference
• /
• 1996.11a
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• pp.66-66
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• 1996

• Proceedings of the Materials Research Society of Korea Conference
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• 1996.11a
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• pp.67-67
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• 1996

• The Korean Journal of Ceramics
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• v.6 no.4
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• pp.396-400
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• 2000

Dielectric and piezoelectric properties of Pb$_0.9$La$_0.1$TiO$_3$ ceramics were investigated as a function of grain size. Sintering atmosphere was controlled with changing the kind of atmospheric powder and its amount. It was confirmed that dielectric and piezoelectric of Pb$_0.9$La$_0.1$TiO$_3$ were strongly influenced by the sintering atmosphere. Relative dielectric constant of Pb$_0.9$La$_0.1$TiO$_3$ which was sintered in PbO-deficient atmosphere made by Pb$_0.9$La$_0.1$TiO$_3$ powder, increased with the grain size. However, the dielectric constant of the samples sintered in the PbO-sufficient atmosphere made by PbZrO$_3$ powder was slightly decreased with the grain size. Piezoelectric d$_33$ constant of Pb$_0.9$La$_0.1$TiO$_3$ also showed a different trend, depending on the sintering atmosphere. It was almost constant in the range of grain size of 1.3~2.3 $\mu$m when the samples were sintered in the PbO-sufficient atmosphere, while it intensively decreased with the grain size in the case of the PbO-deficient condition.

• Journal of the Korean Ceramic Society
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• v.30 no.1
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• pp.1-6
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• 1993

Dielectric and piezoelectric porperties of pseudoternary xPb(Al2/3W1/3)O3-(1-x)Pb(Zr0.52Ti0.48)O3 (x=1~10mol%) ceramic system have been investigated as a function of the amount of PAW[Pb(Al2/3W1/3)O3] and sintered from 110$0^{\circ}C$ to 120$0^{\circ}C$ for 1hr. As the amount of PAW increases, the c/a of tetragonal structure decreases. The grain size was reduced with increasing the amount of PAW addition. However, the density, dielectric constant and electromechanical coupling factor(kp) exhibited a maximum value at the amount of 5mol% PAW addition.

• 한국초전도학회:학술대회논문집
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• v.9
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• pp.300-304
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• 1999

To tap the feasibility of exploiting the 2$^{nd}$ phases as flux-pinning centers in the (Bi,Pb)$_2Sr_2Ca_2CuO_{10}$ superconductor, the size and the distribution of the precipitates have been controlled by changing reaction temperature and time, oxygen partial pressure Po$_2$ and annealing condition. Various annealing heat treatments were also conducted on the as-received 61 filament Bi-2223 tapes with Bi$_{1.8}Pb_{0.4}Sr_2Ca_{2.2}Cu_3O_8$ starting composition and annealed specimen were analyzed with XRD, SEM, EDS and TEM.. The grain size of (Ca,Sr)$_2$(BiPb)O$_4$ or Bi$_{0.5}Pb_3Sr_2Ca_2CuO_{\delta}$ was controllable by optimizing the heat treatment condition and critical current density (J$_c$) showed dependence on the size of the 2$^{nd}$ phases.

• Journal of the Korean Institute of Electrical and Electronic Material Engineers
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• v.17 no.2
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• pp.184-189
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• 2004

The effects of $Y_2$ $O_3$-substitution on the piezoelectric properties of Pb[(N $i_{1}$3/N $b_{2}$3/)$_{0.15}$(Z $r_{1}$2/ $Ti_{1}$2/)$_{0.85}$] $O_3$ceramics were investigated. It was found that $Y^{3+}$ ions incorporate into Pb-sites of the ceramics, resulting in a increased lattice anisotropy and formation of Pb-vacancies. As a result, an orthorhombic-tetragonal phase transition was induced when $\chi$>0.005. At the morphotropic phase boundary of x=0.005, piezoelectric constants( $k_{p}$, $k_{33}$, and $d_{33}$) showed maximum values of 0.53, 0.58, and 350pC/N, respectively. A 30-layer actuator fabricated with the above material showed a maximum strain of 0.12％ under 100V DC bias.